Hot and windy today so cooling system was on high alert. Jogged most of this until the last couple miles were I did a handful of 400s faster with walking breaks. Not sure if I'll ever recapture my old form. Heart still not cooperating and runs 10-20 beats too low.

AM: 6.44 miles. Mixed in some short walking breaks. Heart was just not beating fast enough for energy output. Abstaining from vitamins and other herbal supplements to see if something there has brought on my low heart rate. Long shot, but worth a try. I definitely don't feel overtrained.

Something felt different during this run. The first 30 minutes started out as usual. Felt like I couldn't catch my breath during 15-30 minutes. Took my pulse at 30 minute point and it was around 108. After that point I then gradually started to feel better and breathing easier. Felt more in balance/homeostasis. Checked my pulse again and it was around 96. Lower pulse, but felt better overall and could speed up without much issue other than being out of condition.

AM: 10.9 miles in 1:39:56. Most miles I've covered in a week since last September!

Jogged most of way and felt the same as yesterday energy wise. Felt better around the 35 minute mark. Wore a heart monitor during the run. Heart rate was in the mid-90s up until that time, hitting 100-105 on the small hills. After that time it dropped to the mid-80s and I felt better overall. I use to think that feeling meant my heart rate climbed, but it actually meant it fell. I was going about 9:00 pace. Pulse was in the 85-100 range for the remainder of run until the last mile where it gradually climbed to its max rate of 114. Average pulse for entire run was 92 beats per minute. Not sure what to make of all this. Is this normal? Pulse still seems low for the pace even though it was in the low 9s. Also worth noting is whenever my pulse climbed to around 100 I would produce a belch that would trip a vagal response and briefly lower my heart rate by 5-10 beats. This still occurs frequently regardless of nutrition scheme or strategy. Probably over thinking all of this, but still seems odd this started occurring more frequently about 2 years ago. Hoping that it's supplement related and will clear up in a couple months abstaining from all herbs and vitamins. Still don't think it's overtraining, but parasympathetic form and high vagal tone can't be totally ruled out.